Granted Patent
Utility
US 5,534,057 · App. 08/372,081
Process for treating kaolin clays for pitch control and the treated clays
Inventors:
John M. M. Harrison, Gary M. Freeman, Carl J. Marshall, Jr., James Marvin, Albert F. Lareau
Patented Case
View Patent ↗
Granted: Jul 9, 1996
Filed: Jan 13, 1995
Inventors
John M. M. Harrison
Gary M. Freeman
Carl J. Marshall, Jr.
James Marvin
Albert F. Lareau
Assignee (at issue)
J.M. Huber Corporation
This patent predates the USPTO's electronic file wrapper — prosecution documents from this era exist only in the Patent Office's paper records. A certified copy of the file history can be ordered from the USPTO's paper archives.